The slope of the tangent to the curve $y = ln\, (cos\,x)$ a $x = \frac{3\pi}{4}$ is
The slope of the tangent to the curve $y = ln\, (cos\,x)$ a $x = \frac{3\pi}{4}$ is
- A
$1$
- B
$-1$
- C
$\ln \,\sqrt 2 $
- D
$\frac{1}{{\sqrt 2 }}$
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